It sits on the townland boundary between Ballylopen and Ballyshanedehey, one of a cluster of six related cairns recorded across the area, and yet aerial imagery captured between 2011 and 2013 shows no surface remains whatsoever. What was once substantial enough to mark a territorial edge has been swallowed, whether by plantation forestry, soil accumulation, or simple time, leaving behind little more than a map reference and a record number.

The cartographic history of the site is itself quietly telling. When the Ordnance Survey of Ireland produced its first detailed six-inch maps in 1840, this cairn did not appear at all. The same was true of the 1897 twenty-five-inch edition. It was only on the later Cassini edition of the six-inch map that any annotation appeared, and even then it was labelled simply as a 'Mound', a word that implies something noticed but not understood. Boundary cairns, as a type, are straightforward in concept: accumulations of stone placed deliberately to mark the edges of territorial divisions, in this case the line between two townlands. Townlands are the smallest land divisions in the Irish administrative system, many of them ancient in origin, and their boundaries were sometimes marked with cairns, standing stones, or other features that communities would have recognised and maintained. That this one dropped out of the cartographic record so completely, only to reappear with uncertain status in a later edition, suggests it had already lost much of its legibility by the nineteenth century.

For anyone curious enough to look, Carron Mountain and the Ballylopen area are accessible in the general way of upland Limerick, but the plantation itself complicates any visit. Dense conifer forestry, of the kind planted across much of upland Ireland from the mid-twentieth century onwards, tends to obscure ground features thoroughly, and the archaeological record compiled by Fiona Rooney, uploaded in November 2021, confirms that nothing is visible on the ground from recent imagery. The honest situation is that there may be nothing left to see. The value here is less in the physical object than in the fact of its recording, a reminder that the Irish landscape holds a great many features that have been classified, numbered, and noted precisely because they are disappearing, or have already gone.